Organic light-emitting device

ABSTRACT

An organic light-emitting device including a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer includes a first material represented by Formula 1, and a second material represented by Formula 2,

CROSS-REFERENCE TO RELATED APPLICATION

Korean Patent Application No. 10-2014-0152861, filed on Nov. 5, 2014, inthe Korean Intellectual Property Office, and entitled: “OrganicLight-Emitting Device,” is incorporated by reference herein in itsentirety.

BACKGROUND

1. Field

Embodiments relate to an organic light-emitting device.

2. Description of the Related Art

Organic light-emitting devices are self-emitting devices that have wideviewing angles, high contrast ratios, short response times, andexcellent luminance, driving voltage, and response speedcharacteristics, and produce full-color images.

The organic light-emitting device may include a first electrode disposedon a substrate, and a hole transport region, an emission layer, anelectron transport region, and a second electrode sequentially formed onthe first electrode. Holes injected from the first electrode aretransported to the emission layer through the hole transport region, andelectrons injected from the second electrode are transported to theemission layer through the electron transport region. Carriers, such asthe holes and electrons, recombine in the emission layer to generateexcitons. When the excitons drop from an excited state to a groundstate, light is emitted.

SUMMARY

Embodiments are directed to an organic light-emitting device.

According to one or more exemplary embodiments, an organiclight-emitting device includes a first electrode; a second electrode;and an organic layer that is disposed between the first electrode andthe second electrode and includes an emission layer, wherein the organiclayer includes a first material represented by Formula 1 and a secondmaterial represented by Formula 2:

wherein, in Formulae 1 and 2,

A₁₁ is a C₆-C₆₀ heterocyclic group;

L₁₁ to L₁₄ and L₂₁ to L₂₃ are each independently selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group;

a11 to a14 and a21 to a23 are each independently selected from 0, 1, 2,and 3;

R₁₁ to R₁₄ and R₂₁ to R₂₃ are each independently selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and—B(Q₆)(Q₇);

b11 to b14 and b21 to b23 are each independently selected from 1, 2, 3,and 4;

n11 to n14 and n21 to n23 are each independently selected from 0, 1, 2,and 3;

R₁₅ to R₁₃ and R₂₄ to R₂₆ are each independently selected from ahydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆—C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group;

b15 to b18 and b24 to b26 are each independently selected from 1, 2, 3,and 4;

at least one substituent of the substituted C₃-C₁₀ cycloalkylene group,substituted C₁-C₁₀ heterocycloalkylene group, substituted C₃-C₁₀cycloalkenylene group, substituted C₁-C₁₀ heterocycloalkenylene group,substituted C₆-C₆₀ arylene group, substituted C₁-C₆₀ heteroarylenegroup, substituted divalent non-aromatic condensed polycyclic group,substituted divalent non-aromatic condensed heteropolycyclic group,substituted C₁-C₆₀ alkyl group, substituted C₂-C₆₀ alkenyl group,substituted C₂-C₆₀ alkynyl group, substituted C₁-C₁₀ alkoxy group,substituted C₃-C₁₀ cycloalkyl group, substituted C₁-C₁₀ heterocycloalkylgroup, substituted C₃-C₁₀ cycloalkenyl group, substituted C₁-C₁₀heterocycloalkenyl group, substituted C₆-C₆₀ aryl group, substitutedC₆-C₆₀ aryloxy group, substituted C₆-C₆₀ arylthio group, substitutedC₁-C₆₀ heteroaryl group, substituted monovalent non-aromatic condensedpolycyclic group, and substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group is selected from,

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group; and

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, C₁-C₆₀ alkyl group, C₂-C₆₀ alkenyl group, C₂-C₆₀alkynyl group, C₁-C₆₀ alkoxy group, C₃-C₁₀ cycloalkyl group, C₁-C₁₀heterocycloalkyl group, C₃-C₁₀ cycloalkenyl group, C₁-C₁₀heterocycloalkenyl group, C₆-C₆₀ aryl group, C₆-C₆₀ aryloxy group,C₆-C₆₀ arylthio group, C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇);

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇);

wherein, Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇ and Q₃₁ to Q₃₇ are eachindependently selected from a hydrogen, a C₁-C₆₀ alkyl group, a C₁-C₆₀alkoxy group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group.

BRIEF DESCRIPTION OF THE DRAWING

Features will be apparent to those of skill in the art by describing indetail exemplary embodiments with reference to the attached drawing inwhich:

The FIGURE illustrates a schematic view of a structure of an organiclight-emitting device according to an exemplary embodiment.

DETAILED DESCRIPTION

Example embodiments will now be described more fully hereinafter withreference to the accompanying drawing; however, they may be embodied indifferent forms and should not be construed as limited to theembodiments set forth herein. Rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey exemplary implementations to those skilled in the art.

In the drawing FIGURE, the dimensions of layers and regions may beexaggerated for clarity of illustration. Like reference numerals referto like elements throughout.

As used herein, the term “and/or” includes any and all combinations ofone or more of the associated listed items. Expressions such as “atleast one of,” when preceding a list of elements, modify the entire listof elements and do not modify the individual elements of the list.

As used herein, the singular forms “a”, “an”, and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise.

It will be further understood that the terms, e.g., “includes,”“comprises,” and/or “comprising” used herein specify the presence ofstated features or components, but do not preclude the presence oraddition of one or more other features or components.

It will be understood that when a layer, region, or component isreferred to as being “formed on” another layer, region, or component, itcan be directly or indirectly formed on the other layer, region, orcomponent. For example, intervening layers, regions, or components maybe present.

As used herein, the expression “(an organic layer) includes at leastselected from first materials” may be construed as meaning “(an organiclayer) may include one first material in a range of Formula 1 or atleast two different first materials in a range of Formula 1”.

As used herein, the term “organic layer” refers to a single and/or aplurality of layers disposed between the first electrode and the secondelectrode in an organic light-emitting device. A material included inthe “organic layer” is not limited to an organic material.

The FIGURE illustrates a schematic view of a structure of an organiclight-emitting device according to an exemplary embodiment.

Referring to The FIGURE, a substrate may be additionally disposed undera first electrode 110 or on a second electrode 190. The substrate may bea glass substrate or transparent plastic substrate, each with excellentmechanical strength, thermal stability, transparency, surfacesmoothness, ease of handling, and water resistance.

For example, the first electrode 110 may be formed by depositing orsputtering a first electrode material on the substrate. When the firstelectrode 110 is an anode, the first electrode material may be selectedfrom materials with a high work function to facilitate hole injection.The first electrode 110 may be a reflective electrode, asemi-transmissive electrode, or a transmissive electrode. The firstelectrode material may be a transparent and highly conductive material,and examples of the material may include indium tin oxide (ITO), indiumzinc oxide (IZO), tin oxide (SnO₂), and zinc oxide (ZnO). When the firstelectrode 110 is a semi-transmissive electrode or a reflectiveelectrode, the first electrode material may be at least one selectedfrom magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium(Ca), magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag).

The first electrode 110 may have a single-layer structure or amulti-layer structure including two or more layers. For example, thefirst electrode 110 may have a triple-layer structure of ITO/Ag/ITO.

The organic layer 150 including an emission layer may be disposed on thefirst electrode 110. The organic layer 150 may include a hole transportregion disposed between the first electrode 110 and the emission layerand an electron transport region disposed between the emission layer andthe second electrode 190.

The organic layer 150 may include a first material (e.g., compound)represented by Formula 1 and a second material (e.g., compound)represented by Formula 2:

In Formula 1, A₁₁ may be a C₆-C₆₀ heterocyclic group. For example, A₁₁may be a heterocyclic group that is fused to the other ring of Formula1.

For example, in Formula 1, A₁₁ may be selected from an indole group, aquinoline group, an isoquinoline group, a benzoquinoline group, abenzoisoquinoline group, a naphthyridine group, a quinoxaline group, aquinazoline group, a benzoquinazoline group, a carbazole group, aphenanthridine group, an acridine group, a phenanthroline group, aphenazine group, and a benzimidazole group.

In an implementation, in Formula 1, A₁₁ may be selected from a quinolinegroup, an isoquinoline group, a benzoquinoline group, abenzoisoquinoline group, a naphthyridine group, a quinoxaline group, aquinazoline group, a benzoquinazoline group, a phenanthridine group, anacridine group, a phenanthroline group, a phenazine group, and abenzimidazole group.

In an implementation, in Formula 1, A₁₁ may be selected from abenzoquinoline group, a benzoan isoquinoline group, a benzoa quinazolinegroup, a phenanthridine group, and a phenanthroline group.

In an implementation, in Formula 1, A₁₁ may be selected from abenzoquinoline group and a phenanthroline group.

In Formulae 1 and 2, L₁₁ to L₁₄ and L₂₁ to L₂₃ may each independently beselected from or include, e.g., a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group.

In an implementation, at least one substituent of the substituted C₃-C₁₀cycloalkylene group, substituted C₁-C₁₀ heterocycloalkylene group,substituted C₃-C₁₀ cycloalkenylene group, substituted C₁-C₁₀heterocycloalkenylene group, substituted C₆-C₆₀ arylene group,substituted C₁-C₆₀ heteroarylene group, substituted divalentnon-aromatic condensed polycyclic group, and substituted divalentnon-aromatic condensed heteropolycyclic group is selected from:

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one of adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one of a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid or a salt thereof, a phosphoric acid or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇),

wherein, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇ and Q₃₁ to Q₃₇ are each independentlyselected from a hydrogen, a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkoxy group, aC₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, and a monovalent non-aromatic condensedheteropolycyclic group.

In an implementation, in Formulae 1 and 2, L₁₁ to L₁₄ and L₂₁ to L₂₃ maybe each independently selected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, and adibenzocarbazolylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, and adibenzocarbazolylene group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenylgroup, a biphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group,a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,and an imidazopyridinyl group.

In an implementation, in Formulae 1 and 2, L₁₁ to L₁₄ and L₂₁ to L₂₃ areeach independently selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aphenanthrenylene group, an anthracenylene group, a triphenylenylenegroup, a pyrrolylene group, a thiophenylene group, a furanylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, anindolylene group, a quinolinylene group, an isoquinolinylene group, abenzoquinolinylene group, a naphthyridinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a benzimidazolylene group, a benzofuranylenegroup, a benzothiophenylene group, a triazolylene group, a triazinylenegroup, a dibenzofuranylene group, and a dibenzothiophenylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aphenanthrenylene group, an anthracenylene group, a triphenylenylenegroup, a pyrrolylene group, a thiophenylene group, a furanylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, anindolylene group, a quinolinylene group, an isoquinolinylene group, abenzoquinolinylene group, a naphthyridinylene group, a quinoxalinylenegroup, a quinazolinylene group, a carbazolylene group, aphenanthridinylene group, a benzimidazolylene group, a benzofuranylenegroup, a benzothiophenylene group, a triazolylene group, a triazinylenegroup, a dibenzofuranylene group and a dibenzothiophenylene group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, C₁-C₂₀ alkyl group, C₁-C₂₀ alkoxy group, a phenylgroup, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a triazinyl group, adibenzofuranyl group, and a dibenzothiophenyl group.

In an implementation, in Formulae 1 and 2, L₁₁ to L₁₄ and L₂₁ to L₂₃ mayeach independently be a group represented by one of the followingFormulae 3-1 to 3-18.

In Formulae 3-1 to 3-18,

Y₃₁ may be selected from C(R₃₃)(R₃₄), N(R₃₃), O, and S;

R₃₁ to R₃₄ may each independently be selected from or include, e.g., ahydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a triazinyl group, a dibenzofuranyl group,and a dibenzothiophenyl group.

a31 may be selected from 1, 2, 3, and 4;

a32 may be selected from 1, 2, 3, 4, 5, and 6;

a33 may be selected from 1, 2, 3, 4, 5, 6, 7, and 8;

a34 may be selected from 1, 2, 3, 4, and 5;

a35 may be selected from 1, 2, and 3; and

* and *′ are each independently a binding site to a neighboring atom.

In an implementation, in Formulae 1 and 2, L₁₁ to L₁₄ and L₂₁ to L₂₃ mayeach independently be a group represented by one of the followingFormulae 4-1 to 4-36.

In Formulae 4-1 to 4-36, * and *′ are each independently a binding siteto a neighboring atom.

In Formula 1, a11 denotes the number of L₁₁, and may be selected from 0,1, 2, and 3. When a11 is 2 or greater, a plurality of L₁₁ may beidentical to or different from each other. When a11 is 0, (L₁₁)a₁₁denotes a single bond. In an implementation, a11 may be 0 or 1.Descriptions of a12 to a14 and a21 to a23 may be each independentlyconstrued by referring to the description of a11 and Formulae 1 and 2.

In Formulae 1 and 2, a12 to a14 and a21 to a23 may be each independentlyselected from 0, 1, 2, and 3. In an implementation, a12 to a14 and a21to a23 may be each independently 0 or 1.

In Formulae 1 and 2, R₁₁ to R₁₄ and R₂₁ to R₂₃ may each independently beselected from or include, e.g., a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group,a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₁-C₆₀heteroaryl group, a substituted or unsubstituted monovalent non-aromaticcondensed polycyclic group, a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),—Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇).

In an implementation, at least one substituent of the substituted C₁-C₆₀alkyl group, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀alkynyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀cycloalkyl group, substituted C₁-C₁₀ heterocycloalkyl group, substitutedC₃-C₁₀ cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group is selected from:

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇),

wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇ and Q₃₁ to Q₃₇ are eachindependently selected from a hydrogen, a C₁-C₆₀ alkyl group, a C₁-C₆₀alkoxy group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group.

In an implementation, in Formulae 1 and 2, R₁₁ to R₁₄ and R₂₁ to R₂₃ mayeach independently be selected from:

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolylgroup, a benzoquinolinyl group, a benzoisoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, benzoaquinoxalinyl group, a quinazolinyl group, benzoa quinazolinyl group, acinnolinyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group

, a benzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, athianthrenyl group, a phenoxatinyl group, and a dibenzodioxinyl group,—N(Q₁)(Q₂), and —Si(Q₃)(Q₄)(Q₅); and

a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolylgroup, a benzoquinolinyl group, a benzoisoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, benzoaquinoxalinyl group, a quinazolinyl group, benzoa quinazolinyl group, acinnolinyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group,a benzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, athianthrenyl group, a phenoxatinyl group, and a dibenzodioxinyl group,each substituted with at least one selected from a deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoricacid or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolylgroup, a benzoquinolinyl group, a benzoisoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, benzoaquinoxalinyl group, a quinazolinyl group, benzoa quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, and an imidazopyrimidinyl group,

wherein Q₁ to Q₅ may each independently be selected from a C₁-C₆₀ alkylgroup and a C₆-C₆₀ aryl group.

In an implementation, in Formulae 1 and 2, R₁₁ to R₁₄ and R₂₁ to R₂₃ mayeach independently be selected from:

a phenyl group, a naphthyl group, a fluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyridinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a carbazolyl group, a benzoquinolinyl group, abenzoisoquinolinyl group, a quinoxalinyl group, benzoa quinoxalinylgroup, a quinazolinyl group, benzoa quinazolinyl group, aphenanthridinyl group, a phenanthrolinyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, an imidazopyridinylgroup, an imidazopyrimidinyl group, a thianthrenyl group, a phenoxatinylgroup, a dibenzodioxinyl group, —N(Q₁)(Q₂), and —Si(Q₃)(Q₄)(Q₅); and

a phenyl group, a naphthyl group, a fluorenyl group, a phenanthrenylgroup, an anthracenyl group, a triphenylenyl group, a pyridinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a carbazolyl group, a benzoquinolinyl group, abenzoisoquinolinyl group, a quinoxalinyl group, benzoa quinoxalinylgroup, a quinazolinyl group, benzoa quinazolinyl group, aphenanthridinyl group, a phenanthrolinyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, an imidazopyridinylgroup, an imidazopyrimidinyl group, a thianthrenyl group, a phenoxatinylgroup, and a dibenzodioxinyl group, each substituted with at least oneselected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a triazinyl group, a dibenzofuranyl group,and a dibenzothiophenyl group,

wherein Q₁ to Q₅ may be each independently selected from a methyl group,an ethyl group, an n-propyl group, an iso-propyl group, an n-butylgroup, an iso-butyl group, a sec-butyl group, a tert-butyl group, aphenyl group, and a naphthyl group.

In an implementation, in Formulae 1 and 2, R₁₁ to R₁₄ and R₂₁ to R₂₃ mayeach independently be a group represented by one of the followingFormulae 5-1 to 5-14 and 5-21 to 5-37.

In Formulae 5-1 to 5-14 and 5-21 to 5-37,

X₅₁ may be selected from a single bond, N(R₅₄), C(R₅₄)(R₅₅), O, and S;

X₅₂ may be selected from N(R₅₆), C(R₅₆)(R₅₇), O, and S;

R₅₁ to R₅₇ may each independently be selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a dibenzofuranyl group, and adibenzothiophenyl group;

Q₁ to Q₅ may each independently be selected from a methyl group, anethyl group, an n-propyl group, an iso-propyl group, an n-butyl group,an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenylgroup, and a naphthyl group;

b51 may be selected from 1, 2, 3, 4, and 5;

b52 may be selected from 1, 2, 3, 4, 5, 6, and 7;

b53 may be selected from 1, 2, and 3;

b54 may be selected from 1, 2, 3, and 4;

b55 may be selected from 1, 2, 3, 4, 5, and 6; and

* is a binding site to a neighboring atom.

In an implementation, in Formulae 1 and 2, R₁₁ to R₁₄ and R₂₁ to R₂₃ mayeach independently be a group represented by one of the followingFormulae 6-1 to 6-63 and 6-71 to 6-144.

In Formulae 6-1 to 6-63 and 6-71 to 6-144,

Ph denotes a phenyl group; and

* is a binding site to a neighboring atom.

In Formula 1, b11 denotes the number of R₁₁, and b11 may be selectedfrom 1, 2, 3, and 4. When b11 is 2 or greater, a plurality of R₁₁ may beidentical to or different from each other. In an implementation, b11 maybe 1 or 2. Descriptions of b12 to b14 and b21 to b23 may eachindependently be construed by referring to the description of b11 andFormulae 1 and 2.

In Formulae 1 and 2, b12 to b14 and b21 to b23 may each independently beselected from 1, 2, 3, and 4. In an implementation, in Formulae 1 and 2,b11 b12 to b14 and b21 to b23 may each independently be 1 or 2.

In Formulae 1 and 2, n11 to n14 and n21 to n23 may each independently beselected from 0, 1, 2, and 3. In an implementation, in Formulae 1 and 2,n11 to n14 and n21 to n2 may each independently be 0 or 1.

In an implementation, in Formula 1, a sum of n11 to n14 may be 0 or 1.

In an implementation, in Formula 2, a sum of n21 to n23 may be 1.

In Formulae 1 and 2, R₁₅ to R₁₃ and R₂₄ to R₂₆ may each independently beselected from or include, e.g., a hydrogen, a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group.

In an implementation, at least one substituent of the substituted C₁-C₆₀alkyl group, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀alkynyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀cycloalkyl group, substituted C₁-C₁₀ heterocycloalkyl group, substitutedC₃-C₁₀ cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group may be selected from:

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from a deuterium, —F, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid or a salt thereof, a phosphoric acid or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇); and —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇);

wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇ and Q₃₁ to Q₃₇ may be eachindependently selected from a hydrogen, a C₁-C₆₀ alkyl group, a C₁-C₆₀alkoxy group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group.

In an implementation, in Formulae 1 and 2, R₁₅ to R₁₈ and R₂₄ to R₂₆ mayeach independently be selected from a hydrogen, a deuterium, —F, —Cl,—Br, —I, C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, and amonovalent non-aromatic condensed heteropolycyclic group.

In an implementation, in Formulae 1 and 2, R₁₅ to R₁₈ and R₂₄ to R₂₆ mayeach independently be selected from a hydrogen, a methyl group, an ethylgroup, an n-propyl group, an iso-propyl group, an n-butyl group, aniso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group,and a naphthyl group.

In Formula 1, b15 denotes the number of R₁₅, and b15 may be selectedfrom 1, 2, 3, and 4. When b15 is 2 or greater, a plurality of R₁₅ may beidentical to or different from each other. Descriptions of b16 to b18and b24 to b26 may each independently be construed by referring to thedescription of b15 and Formulae 1 and 2.

In Formulae 1 and 2, b16 to b18 and b24 to b26 may each independently beselected from 1, 2, 3, and 4.

In an implementation, the first material (e.g., represented byFormula 1) may be represented by the following Formula 1-1.

A₁₁, L₁₁, a11, R₁₁, R₁₅ to R₁₈, b11 and b15 to b18 may be the same asdefined above with respect to Formula 1.

In an implementation, the first material may be represented by one ofthe following Formulae 1-11 to 1-22.

In Formulae 1-11 to 1-22,

L₁₁, a11, R₁₁, R₁₅ to R₁₈, b11 and b15 to b18 may be the same as definedabove with respect to Formula 1;

R₁₉ may be the same as defined in connection with R₁₅ in Formula 1; and

b19 may be the same as defined in connection with b15 in Formula 1.

In an implementation, the first material may be represented by one ofthe following Formulae 1-31 to 1-42.

In Formulae 1-31 to 1-42, L₁₁, a11, R₁₁, and b11 may be the same asdefined above with respect to Formula 1.

In an implementation, the first material may be one of the followingCompounds 1 to 12.

In an implementation, the second material (e.g., represented by Formula2) may be represented by the following Formula 2-1.

In Formula 2-1, L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21 and b24 to b26 may be thesame as defined above with respect to Formula 2.

In an implementation, the second material may be represented by one ofthe following Formulae 2-11 and 2-12.

In Formulae 2-11 and 2-12, L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21 and b24 to b26may be the same as defined above with respect to Formula 2.

In an implementation, the second material may be represented by one ofthe following Formulae 2-21 to 2-24.

In Formulae 2-21 to 2-24,

L₂₁, a21, and R₂₁ may be the same as defined above with respect toFormula 2; and

R₂₇ may be the same as defined in connection with R₂₁ in Formula 2.

In an implementation, the second material may be one of the followingCompounds 101 to 124.

The first material may have a high charge transporting property and anappropriate triplet energy level. Thus, an organic light-emitting deviceincluding the first material may have a high carrier density and a largeamount of excitons in an emission layer. The first material may includean electrochemically stable core, and thus lifespan of the organiclight-emitting device including the first material may increase. Forexample, the first material may be electrochemically more stable than acompound having an indenocarbazole moiety as a core.

The second material may have a wide energy gap and a low chargemobility. Thus, the second material may help control a chargetransporting property of the first material.

An organic light-emitting device including the first material and thesecond material may have good charge and hole balance in an emissionlayer, and excitons may be evenly distributed throughout the wholeemission layer. Therefore, the organic light-emitting device includingthe first material and the second material may have improved efficiencyand lifespan characteristics.

A weight ratio of the first material to the second material (e.g., inthe emission layer) may be about 1:9 to about 9:1. In an implementation,a weight ratio of the first material to the second material may be about2:8 to about 8:2. In an implementation, a weight ratio of the firstmaterial to the second material may be about 3:7 to about 7:3. In animplementation, a weight ratio of the first material to the secondmaterial may be about 5:5. When a weight ratio of the first material andthe second material is within these ranges, balance between holetransfer and electron transfer in the emission layer may be effectivelyachieved.

The first material and the second material may be both included in theemission layer in the organic layer 150. In an implementation, all ofthe first material and the second material may be a host.

The hole transport region may be disposed between the first electrode110 and the emission layer.

The hole transport region may include at least one of a hole injectionlayer (HIL), a hole transport layer (HTL), a buffer layer, and anelectron blocking layer (EBL). The electron transport region may includeat least one of a hole blocking layer (HBL), an electron transport layer(ETL), and an electron injection layer (EIL).

The hole transport region may have a single-layered structure formed ofa single material, a single-layered structure formed of a plurality ofdifferent materials, or a multi-layered structure having a plurality oflayers formed of a plurality of different materials.

For example, the hole transport region may have a single-layeredstructure formed of a plurality of different materials, or a structureof hole injection layer/hole transport layer, a structure of holeinjection layer/hole transport layer/buffer layer, a structure of holeinjection layer/buffer layer, a structure of hole transport layer/bufferlayer, a structure of hole injection layer/hole transport layer/electronblocking layer, or a structure of hole transport layer/electron blockinglayer, wherein layers of each of the structures are sequentially stackedfrom the first electrode 110 in this stated order.

When the hole transport region includes a hole injection layer, the holeinjection layer may be formed on the first electrode 110 by usingvarious methods, e.g., vacuum deposition, spin coating, casting, aLangmuir-Blodgett (LB) method, ink-jet printing, laser-printing, orlaser-induced thermal imaging (LITI).

When the hole injection layer is formed by vacuum deposition, the vacuumdeposition may be performed at a deposition temperature in a range ofabout 100° C. to about 500° C., at a vacuum degree in a range of about10⁻⁸ torr to about 10⁻³ torr, and/or at a deposition rate in a range ofabout 0.01 Å/sec to about 100 Å/sec, in consideration of a compound forforming a hole injection layer and a structure of a desired holeinjection layer.

When a hole injection layer is formed by spin coating, the spin coatingmay be performed at a coating rate in a range of about 2,000 rpm toabout 5,000 rpm and/or at a temperature in a range of about 80° C. toabout 200° C., in consideration of a compound for forming a holeinjection layer and a structure of a desired hole injection layer.

When the hole transport region includes a hole transport layer, the holetransport layer may be formed on the first electrode 110 or on the holeinjection layer by using various methods, e.g., vacuum deposition, spincoating, casting, a LB method, ink-jet printing, laser-printing, orLITI. When the hole transport layer is formed by vacuum deposition or byspin coating, the deposition conditions or the coating conditions may beinferred based on the deposition conditions or the coating conditionsfor forming the hole injection layer.

The hole transport region may include, e.g., at least one from m-MTDATA,TDATA, 2-TNATA, NPB, β-NPB, TPD, Spiro-TPD, Spiro-NPB, a methylated NPB,TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecyla benzenesulfonic acid (Pani/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS),polyaniline/camphor sulfonicacid (Pani/CSA),(polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), a compoundrepresented by Formula 201, and a compound represented by Formula 202:

In Formulae 201 and 202,

L₂₀₁ to L₂₀₅ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene, a substituted or unsubstituted C₃-C₁₀cycloalkenylene, a substituted or unsubstituted C₁-C₁₀hetetocycloalkenylene, a substituted or unsubstituted C₆-C₆₀ arylene, asubstituted or unsubstituted C₁-C₆₀ heteroarylene, a substituted orunsubstituted divalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted divalent non-aromatic condensedheteropolycyclic group;

xa1 to xa4 may each independently be selected from 0, 1, 2, and 3;

xa5 is selected from 1, 2, 3, 4, and 5; and

R₂₀₁ to R₂₀₅ may each independently be the same as defined in connectionwith R₁₁ in the present specification.

The compound represented by Formula 201 may be represented by Formula201A:

For example, the compound represented by Formula 201 may be representedby Fomrula 201A-1:

The compound represented by Formula 202 may be represented by Formula202A:

In Formulae 201A, 201A-1, and 202A, L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, andR₂₀₂ to R₂₀₄ may be the same as defined in the present specification,and R₂₁₁ and R₂₁₂ may be the same as defined in connection with R₂₀₃,and R₂₁₃ to R₂₁₆ may each independently be selected from a hydrogen, adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group.

For example, in Formulae 201A, 201A-1, and 202A,

L₂₀₁ to L₂₀₃ may each independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylenegroup; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylenegroup, each substituted with at least one selected from a deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, aphosphoric acid or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxygroup, a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group;

xa1 to xa3 may each independently be 0 or 1;

R₂₀₂ to R₂₀₄, R₂₁₁, and R₂₁₂ may each independently be selected from:

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a Spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, aphenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group, each substituted with at least one selected from adeuterium, —F, —Br, —I, a hydroxyl group, a cyano group, a nitro group,an amino group, an amidino group, a hydrazine group, a hydrazone group,a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof,a phosphoric acid or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group;

R₂₁₃ and R₂₁₄ may each independently be selected from:

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group,a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof,a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenylgroup, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, and a triazinyl group;

R₂₁₅ and R₂₁₆ may each independently be selected from:

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkyl group, anda C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group,a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof,a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group;

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a Spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenylgroup, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, and a triazinyl group;

xa5 may be 1 or 2.

In Formulae 201A and 201A-1, R₂₁₃ and R₂₁₄ may be fused to each otherand form a saturated or unsaturated ring.

The compound represented by Formula 201 and the compound represented byFormula 202 may include Compounds HT1 to HT20 below:

A thickness of the hole transport region may be in a range of about 100Å to about 10,000 Å, e.g., about 100 Å to about 2,000 Å. When the holetransport region includes a hole injection layer and a hole transportlayer, a thickness of the hole injection layer may be in a range ofabout 100 Å to about 10,000 Å, and, e.g., about 100 Å to about 1,000 Å,and a thickness of the hole transport layer may be in a range of about50 Å to about 2,000 Å, and, e.g., about 100 Å to about 1,500 Å. Whenthicknesses of the hole transport region, the hole injection layer, andthe hole transport layer are within these ranges described above, holetransporting properties may be satisfactory without a substantialincrease in a driving voltage.

The hole transport region may further include a charge-generatingmaterial to help improve conductive properties in addition to thementioned materials above. The charge-generating material may behomogeneously or non-homogeneously dispersed throughout the holetransport region.

The charge-generating material may be, e.g., a p-dopant. The p-dopantmay include one selected from a quinone derivative, a metal oxide, and acyano group-containing compound, but it is not limited thereto. Forexample, non-limiting examples of the p-dopant are a quinone derivative,such as tetracyanoquinonedimethane (TCNQ) or2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); ametal oxide, such as a tungsten oxide or a molybdenum oxide, andCompound HT-D1 illustrated below.

The hole transport region may further include at least one selected froma buffer layer and an electron blocking layer, in addition to the holeinjection layer and the hole transport layer. The buffer layer maycompensate an optical resonance distance according to a wavelength oflight emitted from the emission layer, and light-emission efficiency ofan organic light-emitting device thus prepared may be improved. Amaterial included in the buffer layer may be the same with a materialthat may be included in the hole transport region. The electron blockinglayer prevents injection of electrons from the electron transportregion.

An emission layer may be formed on the first electrode 110 or the holetransport region by using various methods, e.g., vacuum deposition, spincoating, casting, a LB method, ink-jet printing, laser-printing, orlaser-induced thermal imaging. When the emission layer is formed byvacuum deposition or spin coating, deposition and coating conditions forthe emission layer may be determined by referring to the deposition andcoating conditions for the hole injection layer.

In the organic layer 150, the emission layer may include a host and adopant.

In an implementation, the host may include the first material and thesecond material.

In the emission layer, the dopant may be included in an amount of, e.g.,about 0.01 part to about 15 parts by weight, based on 100 parts byweight of the host.

A thickness of the emission layer may be about 100 Å to about 1,000 Å,e.g., about 200 Å to about 600 Å. When a thickness of the emission layeris within this range, light-emission characteristics of the emissionlayer may be excellent without a substantial increase in a drivingvoltage.

The dopant may include, e.g., a phosphorescent dopant.

In an implementation, the phosphorescent dopant may include, e.g., anorganometallic compound including one of iridium (Ir), platinum (Pt),osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu),terbium (Tb), thulium (Tm), rhodium (Rh), and copper (Cu).

In an implementation, the phosphorescent dopant may include anorganometallic compound represented by the following Formula 401.

In Formula 401,

M may be selected from, e.g., iridium (Ir), platinum (Pt), osmium (Os),titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium(Tb), thulium (Tm), rhodium (Rh), and copper (Cu);

X₄₀₁ to X₄₀₄ may each independently be, e.g., nitrogen or carbon; and

rings A₄₀₁ and A₄₀₂ may each independently be selected from or include,e.g., a substituted or unsubstituted benzene, a substituted orunsubstituted naphthalene, a substituted or unsubstituted fluorene, asubstituted or unsubstituted spiro-fluorene, a substituted orunsubstituted indene, a substituted or unsubstituted pyrrole, asubstituted or unsubstituted thiophene, a substituted or unsubstitutedfuran, a substituted or unsubstituted imidazole, a substituted orunsubstituted pyrazole, a substituted or unsubstituted thiazole, asubstituted or unsubstituted isothiazole, a substituted or unsubstitutedoxazole, a substituted or unsubstituted isoxazole, a substituted orunsubstituted pyridine, a substituted or unsubstituted pyrazine, asubstituted or unsubstituted pyrimidine, a substituted or unsubstitutedpyridazine, a substituted or unsubstituted quinoline, a substituted orunsubstituted isoquinoline, a substituted or unsubstitutedbenzoquinoline, a substituted or unsubstituted quinoxaline, asubstituted or unsubstituted quinazoline, a substituted or unsubstitutedcarbazole, a substituted or unsubstituted benzimidazole, a substitutedor unsubstituted benzofuran, a substituted or unsubstitutedbenzothiophene, a substituted or unsubstituted isobenzothiophene, asubstituted or unsubstituted benzoxazole, a substituted or unsubstitutedisobenzoxazole, a substituted or unsubstituted triazole, a substitutedor unsubstituted oxadiazole, a substituted or unsubstituted triazine, asubstituted or unsubstituted dibenzofuran and a substituted orunsubstituted dibenzothiophene.

In an implementation, at least one substituent of the substitutedbenzene, substituted naphthalene, substituted fluorene, substitutedspiro-fluorene, substituted indene, substituted pyrrole, substitutedthiophene, substituted furan, substituted imidazole, substitutedpyrazole, substituted thiazole, substituted isothiazole, substitutedoxazole, substituted isoxazole, substituted pyridine, substitutedpyrazine, substituted pyrimidine, substituted pyridazine, substitutedquinoline, substituted isoquinoline, substituted benzoquinoline,substituted quinoxaline, substituted quinazoline, substituted carbazole,substituted benzimidazole, substituted benzofuran, substitutedbenzothiophene, substituted isobenzothiophene, substituted benzoxazole,substituted isobenzoxazole, substituted triazole, substitutedoxadiazole, substituted triazine, substituted dibenzofuran, andsubstituted dibenzothiophene may be selected from:

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₄₀₁)(Q₄₀₂), —Si(Q₄₀₃)(Q₄₀₄)(Q₄₀₅),and —B(Q₄₀₆)(Q₄₀₇);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group and a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group,C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₄₁₁)(Q₄₁₂), —Si(Q₄₁₃)(Q₄₁₄)(Q₄₁₅),and —B(Q₄₁₆)(Q₄₁₇); and

—N(Q₄₂₁)(Q₄₂₂), —Si(Q₄₂₃)(Q₄₂₄)(Q₄₂₅), and —B(Q₄₂₆)(Q₄₂₇).

L₄₀₁ may be, e.g., an organic ligand;

xc1 may be, e.g., 1, 2, or 3;

xc2 may be, e.g., 0, 1, 2, or 3.

In an implementation, L₄₀₁ may be, e.g., a monovalent, divalent, ortrivalent organic ligand. For example, L₄₀₁ may be selected from, e.g.,a halogen ligand (for example, Cl or F), a diketone ligand (for example,acetylacetonate, 1,3-diphenyl-1,3-propandionate,2,2,6,6-tetramethyl-3,5-heptanedionate, or hexafluoroacetonate), acarboxylic acid ligand (for example, picolinate,dimethyl-3-pyrazolecarboxylate, or benzoate), a carbon monoxide ligand,an isonitrile ligand, a cyano ligand, and a phosphorus ligand (forexample, phosphine or phosphite).

In Formula 401, when A₄₀₁ has two or more substituents, the two or moresubstituents of A₄₀₁ may be linked to each other to form a saturated orunsaturated ring.

In Formula 401, when A₄₀₂ has two or more substituents, the two or moresubstituents of A₄₀₂ may be linked to each other to form a saturated orunsaturated ring.

In Formula 401, when xc1 is 2 or greater, a plurality of ligands

in Formula 401 may be identical to or different from each other. InFormula 401, when xc1 is 2 or greater, A₄₀₁ and A₄₀₂ may be respectivelyand directly linked to A₄₀₁ and A₄₀₂ of a different neighboring ligandor may link to A₄₀₁ and A₄₀₂ of a different neighboring ligand via alinking group (e.g. a C₁-C₅ alkylene group, —N(R′)— (where, R′ is aC₁-C₁₀ alkyl group or a C₆-C₂₀ aryl group), or —C(═O)—) therebetween.

In an implementation, the phosphorescent dopant may include at least oneof Compounds PD1 to PD74.

In an implementation, the phosphorescent dopant may include PtOEP.

When the organic light-emitting device 10 is a full color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, or a blue emission layer. In animplementation, the emission layer may have a stacked structure of a redemission layer, a green emission layer, and/or a blue emission layer,and thus white light may be emitted from the emission layer.

Next, the electron transport region may be disposed on the emissionlayer.

The electron transport region may include at least one of a holeblocking layer, an electron transport layer (ETL), and an electroninjection layer.

For example, the electron transport region may have a structure ofelectron transport layer/electron injection layer or a structure of holeblocking layer/electron transport layer/electron injection layer,wherein layers of each structure are sequentially stacked on from theemission layer in the stated order.

The electron transport region may include a hole blocking layer. Thehole blocking layer may be included to help prevent diffusion of tripletexitons or holes to an electron transport layer when a phosphorescentdopant is included in the emission layer.

When the electron transport region includes a hole blocking layer, thehole blocking layer may be formed on the emission layer by using variousmethods, e.g., vacuum deposition, spin coating, casting, aLangmuir-Blodgett (LB) method, ink-jet printing, laser-printing, orlaser-induced thermal imaging (LITI). When the hole blocking layer isformed by vacuum deposition or by spin coating, the depositionconditions or the coating conditions may be inferred based on thedeposition conditions or the coating conditions for forming the holeinjection layer.

For example, the hole blocking layer may include at least one selectedfrom BCP and Bphen.

A thickness of the hole blocking layer may be in a range of about 20 Åto about 1,000 Å, e.g., about 30 Å to about 300 Å. When the thickness ofthe hole blocking layer is within this range, hole blockingcharacteristics of the hole blocking layer may be excellent without asubstantial increase in driving voltage.

The electron transport region may include an electron transport layer.The electron transport layer may be formed on the emission layer byusing various methods, e.g., vacuum deposition, spin coating, casting, aLB method, ink-jet printing, laser-printing, or laser-induced thermalimaging. When an electron transport layer is formed by vacuum depositionor spin coating, vacuum deposition and coating conditions for theelectron transport layer may be determined by referring to the vacuumdeposition and coating conditions for the hole injection layer.

The electron transport layer may include at least one selected from BCPand BPhen above and Alq₃, Balq, TAZ, and NTAZ below.

In an implementation, the electron transport layer may include acompound represented by Formula 601.Ar ₆₀₁-[(L ₆₀₁)_(xe1)-E ₆₀₁]_(xe2)  <Formula 601>

In Formula 601,

Ar₆₀₁ may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene,naphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene;

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene,naphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, each substituted with at least one selected from adeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid or a salt thereof, a sulfonic acid or a saltthereof, a phosphoric acid or a salt thereof, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, and—Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃) (where, Q₃₀₁ to Q₃₀₃ are each independentlyselected from a hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group,a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group);

L₆₀₁ may be the same as defined in connection with L₂₀₁;

E₆₀₁ may be selected from:

a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, and a dibenzocarbazolyl group; and

a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, and a dibenzocarbazolyl group, each substitutedwith at least one selected from a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid or a salt thereof, a phosphoric acid or a saltthereof, C₁-C₂₀ alkyl group, C₁-C₂₀ alkoxy group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, and a dibenzocarbazolyl group;

xe1 may be selected from 0, 1, 2, and 3;

xe2 may be selected from 1, 2, 3, and 4.

In an implementation, the electron transport layer may include acompound represented by Formula 602.

In Formula 602,

X₆₁₁ may be N or C-(L₆₁₁)_(xe611)-R₆₁₁, X₆₁₂ may be N orC-(L₆₁₂)_(xe612)-R₆₁₂, X₆₁₃ may be

N or C-(L₆₁₃)_(xe613)-R₆₁₃, and at least one of X₆₁₁ to X₆₁₃ may be N;

each of L₆₁₁ to L₆₁₆ may be the same as defined in connection with L₂₀₁;

R₆₁₁ to R₆₁₆ may each independently be selected from:

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenylgroup, a naphthyl group, an azulenyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group;

xe611 to xe616 may each independently be selected from 0, 1, 2, and 3.

A compound represented by Formula 601 and a compound represented byFormula 602 may include at least one of the following Compounds ET1 toET15.

A thickness of the electron transport layer may be in a range of about100 Å to about 1,000 Å, e.g., about 150 Å to about 500 Å. When thethickness of the electron transport layer is within this range, holetransporting characteristics of the electron transport layer may beexcellent without a substantial increase in driving voltage.

In an implementation, the electron transport layer may further include ametal-containing material, in addition to the materials described above.

The metal-containing material may include a Li complex. The Li complexmay include, e.g., Compound ET-D1 (lithium quinolate, LiQ) or ET-D2.

The electron transport region may include an electron injection layerthat facilitates electron injection from the second electrode 190.

The electron injection layer may be formed on the electron transportlayer by using various methods, e.g., vacuum deposition, spin coating,casting, a LB method, ink-jet printing, laser-printing, or LITI. When anelectron injection layer is formed by vacuum deposition or spin coating,vacuum deposition and coating conditions for the electron injectionlayer may be determined by referring to the vacuum deposition andcoating conditions for the hole injection layer.

The electron injection layer may include at least one selected from LiF,NaCl, CsF, Li₂O, BaO, and LiQ.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, e.g., about 3 Å to about 90 Å. When the thickness ofthe electron injection layer is within this range, electron injectingcharacteristics of the electron injection layer may be excellent withouta substantial increase in a driving voltage.

The second electrode 190 may be disposed on the electron transportregion. The second electrode 190 may be a cathode that is an electroninjection electrode, and, in this regard, a material for forming thesecond electrode 190 may be a material having a low work function, andsuch a material may be metal, alloy, an electrically conductivecompound, or a mixture thereof. Examples of the material for the secondelectrode 190 may include lithium (Li), magnesium (Mg), aluminum (Al),aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), ormagnesium-silver (Mg—Ag). In an implementation, the material for formingthe second electrode 190 may be ITO or IZO. The second electrode 190 maybe a reflective electrode, a semi-transmissive electrode, or atransmissive electrode.

The organic light-emitting device 10 may be included in a flat displaydevice including a thin film transistor. The thin film transistor mayinclude a gate electrode, source and drain electrodes, a gate insulatinglayer, and an active layer, and one of the source and drain electrodesmay be electrically connected with the first electrode 110 of theorganic light-emitting device 10. The active layer may includecrystalline silicon, amorphous silicon, an organic semiconductor, or anoxide semiconductor, but it is not limited thereto.

A C₁-C₆₀ alkyl group used herein refers to a linear or branchedaliphatic monovalent hydrocarbon group having 1 to 60 carbon atoms, andexamples of the C₁-C₆₀ alkyl group may include a methyl group, an ethylgroup, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group.A C₁-C₆₀ alkylene group used herein refers to a divalent group havingthe same structure with the C₁-C₆₀ alkyl group.

A C₁-C₆₀ alkoxy group used herein refers to a monovalent grouprepresented by —OA₁₀₁ (where, A₁₀₁ is the C₁-C₆₀ alkyl group), andexamples of the C₁-C₆₀ alkoxy group may include a methoxy group, anethoxy group, and an isopropyloxy group.

A C₂-C₆₀ alkenyl group used herein refers to a hydrocarbon groupincluding at least one carbon double bond in the middle or at a terminalof the C₂-C₆₀ alkyl group, and examples of the C₂-C₆₀ alkenyl group mayinclude an ethenyl group, a prophenyl group, and a butenyl group. AC₂-C₆₀ alkenylene group used herein refers to a divalent group havingthe same structure with the C₂-C₆₀ alkenyl group.

A C₂-C₆₀ alkynyl group used herein refers to a hydrocarbon groupincluding at least one carbon triple bond in the middle or at a terminalof the C₂-C₆₀ alkyl group, and examples of the C₂-C₆₀ alkynyl group mayinclude an ethynyl group and a propynyl group. A C₂-C₆₀ alkynylene groupused herein refers to a divalent group having the same structure withthe C₂-C₆₀ alkynyl group.

A C₃-C₁₀ cycloalkyl group used herein refers to a monovalent monocyclicsaturated hydrocarbon group including 3 to 10 carbon atoms, and examplesof the C₃-C₁₀ cycloalkyl group may include a cyclopropyl group, acyclobutyl group, a cyclopentyl group, a cyclohexyl group, and acycloheptyl group. A C₃-C₁₀ cycloalkylene group used herein refers to adivalent group having the same structure with the C₃-C₁₀ cycloalkylgroup.

A C₁-C₁₀ heterocycloalkyl group used herein refers to a monovalentmonocyclic group including at least one hetero atom selected from N, O,P, and S as a ring-forming atom and 1 to 10 carbon atoms, and examplesof the C₁-C₁₀ heterocycloalkyl group may include a tetrahydrofuranylgroup and a tetrahydrothiophenyl group. A C₁-C₁₀ heterocycloalkylenegroup used herein refers to a divalent group having the same structurewith the C₁-C₁₀ heterocycloalkyl group.

A C₃-C₁₀ cycloalkenyl group used herein refers to a monovalentmonocyclic group including 3 to 10 carbon atoms and at least one doublebond in the ring of the C₃-C₁₀ cycloalkenyl group, and does not havearomacity. Examples of the C₃-C₁₀ cycloalkenyl group may include acyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. AC₃-C₁₀ cycloalkenylene group used herein refers to a divalent grouphaving the same structure with the C₃-C₁₀ cycloalkenyl group.

A C₁-C₁₀ heterocycloalkenyl group used herein refers to a monovalentmonocyclic group including at least one hetero atom selected from N, O,P, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least onedouble bond in its ring. Examples of the C₁-C₁₀ heterocycloalkenyl groupmay include a 2,3-hydrofuranyl group and a 2,3-hydrothiophenyl group. AC₁-C₁₀ heterocycloalkenylene group used herein refers to a divalentgroup having the same structure with the C₁-C₁₀ heterocycloalkenylgroup.

A C₆-C₆₀ aryl group used herein refers to a monovalent group including acarbocyclic aromatic system having 6 to 60 carbon atoms, and a C₆-C₆₀arylene group used herein refers to a divalent group including acarbocyclic aromatic system having 6 to 60 carbon atoms. Examples of theC₆-C₆₀ aryl group may include a phenyl group, a naphthyl group, ananthracenyl group, a phenanthrenyl group, a pyrenyl group, and achrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene groupeach include two or more rings, the rings may be fused to each other.

A C₁-C₆₀ heteroaryl group used herein refers to a monovalent grouphaving a carbocyclic aromatic system including at least one hetero atomselected from N, O, P, and S as a ring-forming atom and 1 to 6 carbonatoms. A C₂-C₆₀ heteroarylene group used herein refers to a divalentgroup having a carbocyclic aromatic system including at least one heteroatom selected from N, O, P, and S as a ring-forming atom and 1 to 60carbon atoms. Examples of the C₁-C₆₀ heteroaryl group may include apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, and an isoquinolinylgroup. When the C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylenegroup each include two or more rings, the rings may be fused to eachother.

A C₆-C₆₀ aryloxy group used herein denotes —OA₁₀₂ (where, A₁₀₂ is theC₆-C₆₀ aryl group), and a C₆-C₆₀ arylthio group used herein denotes—SA₁₀₃ (where, A₁₀₃ is the C₆-C₆₀ aryl group).

A monovalent non-aromatic condensed polycyclic group used herein refersto a monovalent group (for example, having 8 to 60 carbon atoms) thathas two or more rings condensed to each other, only carbon atoms as aring forming atom, and non-aromacity in the entire molecular structure.Examples of the monovalent non-aromatic condensed polycyclic group mayinclude a fluorenyl group. A divalent non-aromatic condensed polycyclicgroup used herein refers to a divalent group having the same structurewith the monovalent non-aromatic condensed polycyclic group.

A monovalent non-aromatic condensed heteropolycyclic group used hereinrefers to a momovalent group (for example, having 1 to 60 carbon atoms)that has two or more rings condensed to each other, has a hetero atomselected from N, O, P, and S, other than carbon atoms, as a ring formingatom, and has non-aromacity in the entire molecular structure. Exampleof the monovalent non-aromatic condensed heteropolycyclic group mayinclude a carbazolyl group. A divalent non-aromatic condensedheteropolycyclic group used herein refers to a divalent group having thesame structure with the monovalent non-aromatic condensedheteropolycyclic group.

Hereinafter, an organic light-emitting device according to an embodimentwill be described in further detail with reference to the followingexamples.

The following Examples and Comparative Examples are provided in order tohighlight characteristics of one or more embodiments, but it will beunderstood that the Examples and Comparative Examples are not to beconstrued as limiting the scope of the embodiments, nor are theComparative Examples to be construed as being outside the scope of theembodiments. Further, it will be understood that the embodiments are notlimited to the particular details described in the Examples andComparative Examples.

EXAMPLES Example 1

As an anode, a 15 Ω/cm² (500 Å) ITO glass substrate (available fromCorning Co.) was cut to a size of 50 mm×50 mm×0.5 mm, washed withultrasonic waves in isopropyl alcohol and pure water for 10 minuteseach, and then cleaned with UV and ozone for 10 minutes. The ITO glasssubstrate was then mounted on a vacuum depositor.

2-TNATA was deposited on the ITO anode to form a hole injection layerhaving a thickness of 600 Å, and then NPB was deposited on the holeinjection layer to form a hole transport layer having a thickness of 300Å.

Compound 1, Compound 103, and tris-(2-phenyl pyridine) iridium (III)(hereinafter, also referred to as “Ir(ppy)₃”) were co-deposited on thehole transport layer at a weight ratio of 20:70:10 to form an emissionlayer having a thickness of 400 Å. Then, Alq₃ was deposited on theemission layer at a thickness of 300 Å to form an electron transportlayer, and Al was deposited thereon at a thickness of 1,200 Å to form acathode electrode, thereby completing manufacture of an organiclight-emitting device.

Examples 2 to 18 and Comparative Examples 1 to 8

Organic light-emitting devices were manufactured in the same manner asin Example 1, except that respective compounds shown in Table 1 wereused at a weight ratio shown in Table 1, instead of Compound 1 andCompound 103 in the formation of the emission layer.

Evaluation Example 1

Data of current densities, efficiencies, and lifespans (T₉₀) withrespect to the organic light-emitting devices prepared in Examples 1 to18 and Comparative Examples 1 to 8 were evaluated by using an IVLmeasuring apparatus (Photo Research PR650, Keithley 238), and theresults are shown in Table 1. T₉₀ data (@ 3000 nit) was time consumedfor an organic light-emitting device to have 90% of brightness afterdriving the device compared to its initial brightness (100%).

TABLE 1 Weight ratio Current First Second (First material:second densityEfficiency T₉₀ material material Dopant material:dopant) (mA/cm²) (cd/A)(h) Example 1 1 103 Ir(ppy)₃ 25:65:10 10 46.9 160 Example 2 1 103Ir(ppy)₃ 15:75:10 10 42.5 226 Example 3 4 103 Ir(ppy)₃ 25:65:10 10 49.3110 Example 4 4 103 Ir(ppy)₃ 15:75:10 10 44.9 130 Example 5 11 103Ir(ppy)₃ 25:65:10 10 51.3 188 Example 6 11 103 Ir(ppy)₃ 15:75:10 10 44.3160 Example 7 1 108 Ir(ppy)₃ 25:65:10 10 65.5 220 Example 8 1 108Ir(ppy)₃ 15:75:10 10 48.8 290 Example 9 4 108 Ir(ppy)₃ 25:65:10 10 56.7150 Example 10 4 108 Ir(ppy)₃ 15:75:10 10 51.6 240 Example 11 11 108Ir(ppy)₃ 25:65:10 10 39.6 105 Example 12 11 108 Ir(ppy)₃ 15:75:10 1044.8 100 Example 13 1 120 Ir(ppy)₃ 25:65:10 10 46.1 145 Example 14 1 120Ir(ppy)₃ 15:75:10 10 44.4 160 Example 15 4 120 Ir(ppy)₃ 25:65:10 10 42.0115 Example 16 4 120 Ir(ppy)₃ 15:75:10 10 34.4 140 Example 17 11 120Ir(ppy)₃ 25:65:10 10 24.9 72 Example 18 11 120 Ir(ppy)₃ 15:75:10 10 28.1184 Comparative 1 — Ir(ppy)₃ 90:0:10 10 22.3 21 Example 1 Comparative 4— Ir(ppy)₃ 90:0:10 10 37.1 23 Example 2 Comparative 11 Ir(ppy)₃ 90:0:1010 26.4 41 Example 3 Comparative — 103 Ir(ppy)₃ 0:90:10 10 5.0 3 Example4 Comparative — 108 Ir(ppy)₃ 0:90:10 10 4.6 6 Example 5 Comparative —120 Ir(ppy)₃ 0:90:10 10 4.1 3 Example 6 Comparative Compound A 107Ir(ppy)₃ 25:65:10 10 21.6 35 Example 7 Comparative Compound A 107Ir(ppy)₃ 15:75:10 10 18.3. 60 Example 8

Referring to Table 1, it may be seen that the organic light-emittingdevices prepared in Examples 1 to 18 exhibited better performance thanthose of the organic light-emitting devices prepared in ComparativeExamples 1 to 8.

As described above, according to the one or more of the above exemplaryembodiments, an organic light-emitting device may have high efficiencyand long lifespan characteristics.

Example embodiments have been disclosed herein, and although specificterms are employed, they are used and are to be interpreted in a genericand descriptive sense only and not for purpose of limitation. In someinstances, as would be apparent to one of ordinary skill in the art asof the filing of the present application, features, characteristics,and/or elements described in connection with a particular embodiment maybe used singly or in combination with features, characteristics, and/orelements described in connection with other embodiments unless otherwisespecifically indicated. Accordingly, it will be understood by those ofskill in the art that various changes in form and details may be madewithout departing from the spirit and scope of the present invention asset forth in the following claims.

What is claimed is:
 1. An organic light-emitting device, comprising: afirst electrode; a second electrode; and an organic layer between thefirst electrode and the second electrode, the organic layer including anemission layer, wherein the organic light-emitting device exhibits a T₉₀lifespan of 188 hours to 290 hours, when measured at a current densityof 10 mA/cm² and at 3,000 nit, wherein the organic layer includes: afirst material represented by Formula 1, and a second materialrepresented by Formula 2,

wherein, in Formulae 1 and 2, A₁₁ is a C₆-C₆₀ heterocyclic group; L₁₁ toL₁₄ and L₂₁ to L₂₃ are each independently selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group; a11 to a14 and a21 to a23are each independently selected from 0, 1, 2, and 3; R₁₁ to R₁₄ and R₂₁to R₂₃ are each independently selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), and—B(Q₆)(Q₇); b11 to b14 and b21 to b23 are each independently selectedfrom 1, 2, 3, and 4; n11 to n14 and n21 to n23 are each independentlyselected from 0, 1, 2, and 3; R₁₅ to R₁₈ and R₂₄ to R₂₆ are eachindependently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid or a saltthereof, a sulfonic acid or a salt thereof, a phosphoric acid or a saltthereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group; b15 to b18 and b24 to b26 are each independentlyselected from 1, 2, 3, and 4; at least one substituent of thesubstituted C₃-C₁₀ cycloalkylene group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀ cycloalkenylene group,substituted C₁-C₁₀ heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀ heteroarylene group, substituteddivalent non-aromatic condensed polycyclic group, substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group is selected from: a deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group,each substituted with at least one selected from a deuterium, —F, —Cl,−Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoricacid or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), and—B(Q₁₆)(Q₁₇); a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group; aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from a deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidor a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acidor a salt thereof, C₁-C₆₀ alkyl group, C₂-C₆₀ alkenyl group, C₂-C₆₀alkynyl group, C₁-C₆₀ alkoxy group, C₃-C₁₀ cycloalkyl group, C₁-C₁₀heterocycloalkyl group, C₃-C₁₀ cycloalkenyl group, C₁-C₁₀heterocycloalkenyl group, C₆-C₆₀ aryl group, C₆-C₆₀ aryloxy group,C₆-C₆₀ arylthio group, C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), and—B(Q₂₆)(Q₂₇); and —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇);wherein, Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ are eachindependently selected from a hydrogen, a C₁-C₆₀ alkyl group, a C₁-C₆₀alkoxy group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group.
 2. The organiclight-emitting device as claimed in claim 1, wherein A₁₁ is selectedfrom an indole group, a quinoline group, an isoquinoline group, abenzoquinoline group, a benzoisoquinoline group, a naphthyridine group,a quinoxaline group, a quinazoline group, a benzoquinazoline group, acarbazole group, a phenanthridine group, an acridine group, aphenanthroline group, a phenazine group, and a benzimidazole group. 3.The organic light-emitting device as claimed in claim 1, wherein L₁₁ toL₁₄ and L₂₁ to L₂₃ are each independently selected from: a phenylenegroup, a pentalenylene group, an indenylene group, a naphthylene group,an azulenylene group, a heptalenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a spiro-fluorenylene group,a benzofluorenylene group, a dibenzofluorenylene group, a phenalenylenegroup, a phenanthrenylene group, an anthracenylene group, afluoranthenylene group, a triphenylenylene group, a pyrenylene group, achrysenylene group, a naphthacenylene group, a picenylene group, aperylenylene group, a pentaphenylene group, a hexacenylene group, apentacenylene group, a rubicenylene group, a coronenylene group, anovalenylene group, a pyrrolylene group, a thiophenylene group, afuranylene group, an imidazolylene group, a pyrazolylene group, athiazolylene group, an isothiazolylene group, an oxazolylene group, anisoxazolylene group, a pyridinylene group, a pyrazinylene group, apyrimidinylene group, a pyridazinylene group, an isoindolylene group, anindolylene group, an indazolylene group, a purinylene group, aquinolinylene group, an isoquinolinylene group, a benzoquinolinylenegroup, a phthalazinylene group, a naphthyridinylene group, aquinoxalinylene group, a quinazolinylene group, a cinnolinylene group, acarbazolylene group, a phenanthridinylene group, an acridinylene group,a phenanthrolinylene group, a phenazinylene group, a benzimidazolylenegroup, a benzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, and adibenzocarbazolylene group; and a phenylene group, a pentalenylenegroup, an indenylene group, a naphthylene group, an azulenylene group, aheptalenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a spiro-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a naphthacenylene group, a picenylene group, a perylenylenegroup, a pentaphenylene group, a hexacenylene group, a pentacenylenegroup, a rubicenylene group, a coronenylene group, an ovalenylene group,a pyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, and adibenzocarbazolylene group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenylgroup, a biphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group,a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,and an imidazopyridinyl group.
 4. The organic light-emitting device asclaimed in claim 1, wherein L₁₁ to L₁₄ and L₂₁ to L₂₃ are eachindependently a group represented by one of the following Formulae 3-1to 3-18:

wherein, in Formulae 3-1 to 3-18, Y₃₁ is selected from C(R₃₃)(R₃₄),N(R₃₃), O, and S; R₃₁ to R₃₄ are each independently selected from ahydrogen, a deuterium, —F, —C₁, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid or a salt thereof, asulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a triazinyl group, a dibenzofuranyl group,and a dibenzothiophenyl group; a31 is selected from 1, 2, 3, and 4; a32is selected from 1, 2, 3, 4, 5, and 6; a33 is selected from 1, 2, 3, 4,5, 6, 7, and 8; a34 is selected from 1, 2, 3, 4, and 5; a35 is selectedfrom 1, 2, and 3; * and *′ are each independently a binding site to aneighboring atom.
 5. The organic light-emitting device as claimed inclaim 1, wherein R₁₁ to R₁₄ and R₂₁ to R₂₃ are each independentlyselected from: a phenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolylgroup, a benzoquinolinyl group, a benzoisoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, benzoaquinoxalinyl group, a quinazolinyl group, benzoa quinazolinyl group, acinnolinyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group,a benzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolylgroup, an imidazopyridinyl group, an imidazopyrimidinyl group, athianthrenyl group, a phenoxatinyl group, a dibenzodioxinyl group,—N(Q₁)(Q₂), and —Si(Q₃)(Q₄)(Q₅); and a phenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenalenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a naphthacenyl group, a picenyl group, a perylenyl group, apentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenylgroup, a coronenyl group, an ovalenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a carbazolyl group, a benzoquinolinyl group, a benzoisoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, benzoa quinoxalinyl group, a quinazolinyl group, benzoaquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, a thiadiazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, a thianthrenyl group, a phenoxatinyl group,and a dibenzodioxinyl group, each substituted with at least one selectedfrom a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid ora salt thereof, a phosphoric acid or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a carbazolyl group, a benzoquinolinyl group, abenzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group,a quinoxalinyl group, benzoa quinoxalinyl group, a quinazolinyl group,benzoa quinazolinyl group, a cinnolinyl group, a carbazolyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group,an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, a thiadiazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group, wherein, Q₁ to Q₅ are each independentlyselected from a C₁-C₆₀ alkyl group and a C₆-C₆₀ aryl group.
 6. Theorganic light-emitting device as claimed in claim 1, wherein R₁₁ to R₁₄and R₂₁ to R₂₃ are each independently a group represented by one of thefollowing Formulae 5-1 to 5-14 and 5-21 to 5-37:

wherein, in Formulae 5-1 to 5-14 and 5-21 to 5-37, X₅₁ is selected froma single bond, N(R₅₄), C(R₅₄)(R₅₅), O, and S; X₅₂ is selected fromN(R₅₆), C(R₅₆)(R₅₇), O, and S; R₅₁ to R₅₇ are each independentlyselected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid or a salt thereof,a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof,a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a triazinyl group, a dibenzofuranyl group,and a dibenzothiophenyl group, Q₁ to Q₅ are each independently selectedfrom a methyl group, an ethyl group, an n-propyl group, an iso-propylgroup, an n-butyl group, an iso-butyl group, a sec-butyl group, atert-butyl group, a phenyl group, and a naphthyl group; b51 is selectedfrom 1, 2, 3, 4, and 5; b52 is selected from 1, 2, 3, 4, 5, 6, and 7;b53 is selected from 1, 2, and 3; b54 is selected from 1, 2, 3, and 4;b55 is selected from 1, 2, 3, 4, 5, and 6; and * is a binding site to aneighboring atom.
 7. The organic light-emitting device as claimed inclaim 1, wherein b11 to b14 and b21 to b23 are each independently 1 or2.
 8. The organic light-emitting device as claimed in claim 1, whereinn11 to n14 and n21 to n23 are each independently 0 or
 1. 9. The organiclight-emitting device as claimed in claim 1, wherein R₁₅ to R₁₈ and R₂₄to R₂₆ are each independently selected from a hydrogen, a deuterium, —F,—Cl, —Br, —I, C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group.
 10. Theorganic light-emitting device as claimed in claim 1, wherein the firstmaterial represented by Formula 1 is represented by Formula 1-1:

wherein, in Formula 1-1, A₁₁, L₁₁, a11, R₁₁, R₁₆ to R₁₈, b11, and b15 tob18 are defined the same as A₁₁, L₁₁, a11, R₁₁, R₁₆ to R₁₈, b11, and b15to b18 of Formula
 1. 11. The organic light-emitting device as claimed inclaim 1, wherein the first material represented by Formula 1 isrepresented by one of the following Formulae 1-11 to 1-22:

wherein, in Formulae 1-11 to 1-22, L₁₁, a11, R₁₁, R₁₅ to R₁₈, b11 andb15 to b18 are defined the same as L₁₁, a11, R₁₁, R₁₅ to R₁₈, b11 andb15 to b18 of Formula 1, R₁₉ is defined the same as R₁₅ of Formula 1;and b19 is defined the same as b15 of Formula
 1. 12. The organiclight-emitting device as claimed in claim 1, wherein the first materialrepresented by Formula 1 is represented by one of the following Formulae1-31 to 1-42:

wherein, in Formulae 1-31 to 1-42, L₁₁, a11, R₁₁, and b11 are definedthe same as L₁₁, a11, R₁₁, and b11 of Formula
 1. 13. The organiclight-emitting device as claimed in claim 1, wherein the first materialrepresented by Formula 1 is one of the following Compounds 1 to 12:


14. The organic light-emitting device as claimed in claim 1, wherein thesecond material represented by Formula 2 is represented by Formula 2-1:

wherein, in Formula 2-1, L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21, and b24 to b26are defined the same as L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21, and b24 to b26of Formula
 2. 15. The organic light-emitting device as claimed in claim1, wherein the second material represented by Formula 2 is representedby one of the following Formulae 2-11 and 2-12:

wherein, in Formulae 2-11 and 2-12, L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21, andb24 to b26 are defined the same as L₂₁, a21, R₂₁, R₂₄ to R₂₆, b21, andb24 to b26 of Formula
 2. 16. The organic light-emitting device asclaimed in claim 1, wherein the second material represented by Formula 2is represented by one of the following Formulae 2-21 to 2-24:

wherein, in Formulae 22-21 to 2-24, L₂₁, a21, and R₂₁ are defined thesame as L₂₁, a21, and R₂₁ of Formula 2, and R₂₇ is defined the same asR₂₁ of Formula
 2. 17. The organic light-emitting device as claimed inclaim 1, wherein the second material represented by Formula 2 is one ofthe following Compounds 101 to 124:


18. The organic light-emitting device as claimed in claim 1, wherein thefirst material and the second material are included in the emissionlayer.
 19. The organic light-emitting device as claimed in claim 1,wherein a weight ratio of the first material to the second material isabout 1:9 to about 9:1.
 20. The organic light-emitting device as claimedin claim 18, wherein the emission layer includes an organometalliccompound as a dopant, the organometallic compound including at least oneof iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium(Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), rhodium(Rh), and copper (Cu).